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mac80211: fix mesh airtime link metric estimating 

Airtime link metric estimation was broken in HT mesh, use
cfg80211_calculate_bitrate to get the right rate value.

Also factor out tx rate copying from sta_set_sinfo().

Signed-off-by: Thomas Pedersen <thomas@cozybit.com>
Reviewed-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Thomas Pedersen 2012-03-05 15:31:48 -08:00 committed by John W. Linville
parent 8097e14944
commit 6b62bf3263
3 changed files with 22 additions and 10 deletions
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23
net/mac80211/cfg.c
View File

@ -336,6 +336,20 @@ static void rate_idx_to_bitrate(struct rate_info *rate, struct sta_info *sta, in
rate->mcs = idx;
}
void sta_set_rate_info_tx(struct sta_info *sta,
const struct ieee80211_tx_rate *rate,
struct rate_info *rinfo)
{
rinfo->flags = 0;
if (rate->flags & IEEE80211_TX_RC_MCS)
rinfo->flags |= RATE_INFO_FLAGS_MCS;
if (rate->flags & IEEE80211_TX_RC_40_MHZ_WIDTH)
rinfo->flags |= RATE_INFO_FLAGS_40_MHZ_WIDTH;
if (rate->flags & IEEE80211_TX_RC_SHORT_GI)
rinfo->flags |= RATE_INFO_FLAGS_SHORT_GI;
rate_idx_to_bitrate(rinfo, sta, rate->idx);
}
static void sta_set_sinfo(struct sta_info *sta, struct station_info *sinfo)
{
struct ieee80211_sub_if_data *sdata = sta->sdata;
@ -378,14 +392,7 @@ static void sta_set_sinfo(struct sta_info *sta, struct station_info *sinfo)
sinfo->signal_avg = (s8) -ewma_read(&sta->avg_signal);
}
sinfo->txrate.flags = 0;
if (sta->last_tx_rate.flags & IEEE80211_TX_RC_MCS)
sinfo->txrate.flags |= RATE_INFO_FLAGS_MCS;
if (sta->last_tx_rate.flags & IEEE80211_TX_RC_40_MHZ_WIDTH)
sinfo->txrate.flags |= RATE_INFO_FLAGS_40_MHZ_WIDTH;
if (sta->last_tx_rate.flags & IEEE80211_TX_RC_SHORT_GI)
sinfo->txrate.flags |= RATE_INFO_FLAGS_SHORT_GI;
rate_idx_to_bitrate(&sinfo->txrate, sta, sta->last_tx_rate.idx);
sta_set_rate_info_tx(sta, &sta->last_tx_rate, &sinfo->txrate);
sinfo->rxrate.flags = 0;
if (sta->last_rx_rate_flag & RX_FLAG_HT)

6
net/mac80211/mesh_hwmp.c
View File

@ -324,6 +324,7 @@ static u32 airtime_link_metric_get(struct ieee80211_local *local,
struct sta_info *sta)
{
struct ieee80211_supported_band *sband;
struct rate_info rinfo;
/* This should be adjusted for each device */
int device_constant = 1 << ARITH_SHIFT;
int test_frame_len = TEST_FRAME_LEN << ARITH_SHIFT;
@ -337,7 +338,9 @@ static u32 airtime_link_metric_get(struct ieee80211_local *local,
if (sta->fail_avg >= 100)
return MAX_METRIC;
if (sta->last_tx_rate.flags & IEEE80211_TX_RC_MCS)
sta_set_rate_info_tx(sta, &sta->last_tx_rate, &rinfo);
rate = cfg80211_calculate_bitrate(&rinfo);
if (WARN_ON(!rate))
return MAX_METRIC;
err = (sta->fail_avg << ARITH_SHIFT) / 100;
@ -345,7 +348,6 @@ static u32 airtime_link_metric_get(struct ieee80211_local *local,
/* bitrate is in units of 100 Kbps, while we need rate in units of
* 1Mbps. This will be corrected on tx_time computation.
*/
rate = sband->bitrates[sta->last_tx_rate.idx].bitrate;
tx_time = (device_constant + 10 * test_frame_len / rate);
estimated_retx = ((1 << (2 * ARITH_SHIFT)) / (s_unit - err));
result = (tx_time * estimated_retx) >> (2 * ARITH_SHIFT) ;

3
net/mac80211/sta_info.h
View File

@ -529,6 +529,9 @@ void sta_info_init(struct ieee80211_local *local);
void sta_info_stop(struct ieee80211_local *local);
int sta_info_flush(struct ieee80211_local *local,
struct ieee80211_sub_if_data *sdata);
void sta_set_rate_info_tx(struct sta_info *sta,
const struct ieee80211_tx_rate *rate,
struct rate_info *rinfo);
void ieee80211_sta_expire(struct ieee80211_sub_if_data *sdata,
unsigned long exp_time);